EPC rating and sold prices in PO4 (Portsmouth)
In postcode district PO4 (Portsmouth), homes rated EPC C or better sold for 12% more per square metre than D–G homes (median £3,140 vs £2,815, 7,440 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 4.4% more (95% range +3.2% to +5.6%). 3 of 3 sectors with enough sales show a difference distinguishable from zero. Data: HM Land Registry to 30 September 2026, EPC register.
From the raw gap to like-for-like
The homes are not alike: C+ homes here have a median floor area of 79 m² against 84 m² for D–G; both groups are most often built in 1900–1929; 8% of C+ and 8% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +12% | — |
| Whole price, nothing held equal | −1.0% | −3.0% to +1.0% |
| Same floor area | +9.3% | +7.9% to +10.8% |
| + same property type | +11.8% | +10.4% to +13.3% |
| + same build period | +7.8% | +6.4% to +9.2% |
| + same year of sale | +4.4% | +3.2% to +5.6% |
The first row compares median prices per m²; the second compares whole prices; each later row adds one more thing that must be equal, ending with the like-for-like premium (regression of log price; build period from the certificate, 12 bands). The raw gap per m² and the whole-price gap differ because C+ and D–G homes differ in size.
Postcode sectors in PO4
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| PO4 0 | 2,101 | +17% | +5.7% ▲ | +3.2% to +8.3% |
| PO4 8 | 2,553 | +9% | +1.7% ▲ | +0.3% to +3.2% |
| PO4 9 | 2,786 | +10% | +3.9% ▲ | +1.8% to +6.0% |
▲ green: premium distinguishable from zero; ▼ red: discount; plain: no measurable difference. Small areas have fewer sales, so their 95% ranges are wider.
Sold prices by EPC band in PO4
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 7 | too few |
| B | 340 | £3,433 |
| C | 1,910 | £3,120 |
| D | 4,024 | £2,856 |
| E | 913 | £2,692 |
| F | 184 | £2,586 |
| G | 62 | £2,422 |
A median is shown when a band has at least 10 sales.
How this is calculated
- Every standard sale (HM Land Registry Price Paid, category A) since January 2015 is matched to the latest energy certificate of the same address (postcode + house number or name + flat) lodged from 10 years before to 3 months after the sale; sales with no certificate or an ambiguous match are left out. Across England and Wales 92% of sales match.
- Price per m² uses the certificate's total floor area (15–1,000 m²).
- Like-for-like premium: regression of the log of price on “C or better”, log floor area, property type, the certificate's build period and the year of sale. The 95% range shows how precise the estimate is; when it includes zero, the data cannot tell the premium apart from none.
Caveats
- The band is the one on the certificate before the sale; certificates are a median 0.8 years old at the sale, but a quarter are over 4 years old and some homes were improved since.
- Condition, garden, parking, views and the exact position within the sector are not known; a premium could hide in them, or they could hide one.
- Individual sales and addresses are not shown.